N[1/7]
N[1/7,20]
N[1000!,20]
N[2^1000,20]
N[Sin[5],30]
N[Cos[5],30] 
N[Tan[5],30] 
N[Cot[5],30] 
N[Sec[5],30] 
N[Csc[5],30] 
N[ArcSin[0.5000000000000000000000000000000000000000],30]
N[ArcCos[0.5000000000000000000000000000000000000000],30]
N[ArcTan[5],30] 
N[Sinh[5],30] 
N[Cosh[5],30] 
N[Tanh[5],30] 
N[Coth[5],30] 
N[Sech[5],30] 
N[Csch[5],30]
N[ArcSinh[5],30]
N[ArcCosh[5],30]  
N[ArcTanh[0.5000000000000000000000000000000000000000],30] 
N[Exp[0.5],30]
N[Log[5],30]
N[Log2[5],30]
N[Log10[5],30]
N[Sqrt[5],30] 
N[Gamma[33/10],30]
N[LogGamma[33/10],30]
N[Zeta[2],30]
N[Erf[33/10],30]
N[Erfc[0.95], 30]
N[Exp[Sin[5]],30]
N[Pi]
N[E]
N[Euler]
N[E,30]
N[Pi,30]
N[Euler,30]
